Calendar made with scrapbook paper and an 18" x 14" picture frame. Use sharpie for the dry erase marker and use rubbing alcohol at the end of the month to remove the sharpie. So many different options :)
Pilot FriXion Colors Erasable Marker - 12 Color Set
These are the most amazing pens I've encountered. I like to draw in pen, namely because it looks sharper, and erasable pens usually suck. BUT these erase with friction (both in gel and marker pen style), leaving NO trace, and no eraser shavings. It erases better than pencils and doesn't smudge during use. I'm smitten.